fix(app): sanitize workspace store filenames on Windows (#16703)

packages/app/src/utils/persist.test.ts

@@ -104,4 +104,12 @@ describe("persist localStorage resilience", () => {
     const result = persistTesting.normalize({ value: "ok" }, '{"value":"\\x"}')
     expect(result).toBeUndefined()
   })
+
+  test("workspace storage sanitizes Windows filename characters", () => {
+    const result = persistTesting.workspaceStorage("C:\\Users\\foo")
+
+    expect(result).toStartWith("opencode.workspace.")
+    expect(result.endsWith(".dat")).toBeTrue()
+    expect(/[:\\/]/.test(result)).toBeFalse()
+  })
 })

packages/app/src/utils/persist.ts

@@ -204,7 +204,7 @@ function normalize(defaults: unknown, raw: string, migrate?: (value: unknown) =>
 }
 
 function workspaceStorage(dir: string) {
-  const head = dir.slice(0, 12) || "workspace"
+  const head = (dir.slice(0, 12) || "workspace").replace(/[^a-zA-Z0-9._-]/g, "-")
   const sum = checksum(dir) ?? "0"
   return `opencode.workspace.${head}.${sum}.dat`
 }
@@ -300,6 +300,7 @@ export const PersistTesting = {
   localStorageDirect,
   localStorageWithPrefix,
   normalize,
+  workspaceStorage,
 }
 
 export const Persist = {